I can't talk you out of the Sig. But I think you should be aware of a short trigger Sig offers that may correct the issue you're experiencing. You'll have to spend more money on an aready pricey gun, but it may be more worth while than losing money on what you've already paid if you can correct the length of pull issue.
Everyday I think maybe I should have become a Glock fan over that of Sig, but then I realize why I started on Sigs in the first place. It's build quality and the ergonomics (for my hand).